使用Flask的WTForm进行邮箱验证

Question

我正在跟着一个关于Flask的教程，地址是 http://code.tutsplus.com/tutorials/intro-to-flask-adding-a-contact-page--net-28982，现在卡在了验证这一步。

旧版本的代码是这样的：

from flask.ext.wtf import Form, TextField, TextAreaField, SubmitField, validators, ValidationError

class ContactForm(Form):
name = TextField("Name",  [validators.Required("Please enter your name.")])
email = TextField("Email",  [validators.Required("Please enter your email address."), validators.Email("Please enter your email address.")])
submit = SubmitField("Send")

看了评论后，我把它更新成了这样：（把validators.Required换成了InputRequired）

(same fields)  

class ContactForm(Form):  
name = TextField("Name", validators=[InputRequired('Please enter your name.')])
email = EmailField("Email",  validators=[InputRequired("Please enter your email address.")]), validators.Email("Please enter your email address.")])
submit = SubmitField("Send")

我唯一的问题是我不知道该怎么处理validators.Email。出现的错误信息是：

NameError: name 'validators' is not defined

我查阅了文档，也许我没有深入研究，但我找不到关于邮箱验证的例子。

Answer 1

只需要用pip来安装一个叫做email_validator的工具，比如这样：

pip install email_validator

Answer 2

  from flask_wtf import FlaskForm from wtforms import StringField, PasswordField, BooleanField, SubmitField 
  from wtforms.fields.html5 import EmailField 
  from wtforms.validators import DataRequired, Email

  class LoginForm(FlaskForm):
      username = StringField('Username', validators=[DataRequired()])
      email = EmailField('Email Address', validators=[DataRequired(), Email()])
      password = PasswordField('Password', validators=[DataRequired()])
      remember_me = BooleanField('Remember me')
      submit = SubmitField('Sign In')

当然可以！请把你想要翻译的内容发给我，我会帮你用简单易懂的语言解释清楚。

Answer 3

from flask_wtf import FlaskForm
from wtforms import StringField
from wtforms.validators import DataRequired, Email

class ContactForm(FlaskForm):  
    name = StringField("Name", validators=[DataRequired()])
    email = StringField("Email",  validators=[DataRequired(), Email()])
    submit = SubmitField("Send")

当然可以！请把你想要翻译的内容发给我，我会帮你用简单易懂的语言解释清楚。

Answer 4

我最近又看了一遍之前的教程，因为我有好几年没碰过Flask了。

出现的问题是因为Flask-WTF在0.9版本时做了一些改变。在这里，他们提到：

注意：从0.9.0版本开始，Flask-WTF不再从wtforms导入任何东西，你需要自己从wtforms导入字段。

要直接导入，forms.py文件应该这样写：

from flask.ext.wtf import Form
from wtforms import StringField, TextAreaField, SubmitField
from wtforms.validators import InputRequired, Email

class ContactForm(Form):
  name = StringField("Name",  [InputRequired("Please enter your name.")])
  email = StringField("Email",  [InputRequired("Please enter your email address."), Email("This field requires a valid email address")])
  subject = StringField("Subject",  [InputRequired("Please enter a subject.")])
  message = TextAreaField("Message",  [InputRequired("Not including a message would be stupid")])
  submit = SubmitField("Send")

注意，StringField替代了TextField，而InputRequired 比 DataRequired更受欢迎。个人偏好是直接导入验证器，而不是导入整个命名空间。你也可以这样写：from wtforms import *，然后在表单类中：name = StringField("Name", [validators.InputRequired("message")

在你更新到最新版本的Flask-WTF时，最好在你的视图中也使用validate_on_submit()（这里推荐这样做）。

而且方便的validate_on_submit会检查请求是否是POST，并且验证是否有效。

Answer 5

试试这个：

from flask.ext.wtf import Form
from wtforms import validators
from wtforms.fields.html5 import EmailField

class ContactForm(Form):
    email = EmailField('Email address', [validators.DataRequired(), validators.Email()])